CN110144574A - A kind of lubricant coating of steel wire and the method for forming lubricant coating in steel wire surface - Google Patents
A kind of lubricant coating of steel wire and the method for forming lubricant coating in steel wire surface Download PDFInfo
- Publication number
- CN110144574A CN110144574A CN201910279200.8A CN201910279200A CN110144574A CN 110144574 A CN110144574 A CN 110144574A CN 201910279200 A CN201910279200 A CN 201910279200A CN 110144574 A CN110144574 A CN 110144574A
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- China
- Prior art keywords
- steel wire
- lubricant coating
- coating
- boronation
- phosphorization
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C9/00—Cooling, heating or lubricating drawing material
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Extraction Processes (AREA)
Abstract
The method that the present invention provides a kind of lubricant coating of steel wire and forms lubricant coating in steel wire surface, the lubricant coating of steel wire are formed by two layers, from inside to outside respectively phosphorization membrane and boronation film layer；The phosphating coat 1.4-6.1g/ ㎡；The boronation film 0.3-5.1g/ ㎡；The phosphorization membrane is composed of the following components: trbasic zinc phosphate, zinc iron phosphate, wherein zinc iron phosphate accounting is 4-7%.Lubricant coating of the present invention is applicable to the finer wire high speed drawing of steel wire diameter 3-6.5mm, phosphorus content 0.7% or so, and high with the bond strength of steel wire, removing rate is lower than 3% after drawing.
Description
Technical field
It is lubricated the present invention relates to the lubricant coating of the field of metal processing more particularly to a kind of steel wire and being formed in steel wire surface
The method of coating.
Background technique
Steel wire is surface-treated in production drawing process, to guarantee that steel wire drawing process is smooth, needs drawing
Preceding carry out lubricant coating.Lubricant coating, which refers to, coats one layer of lubricant or Lubrication carrier in steel wire surface, and main function is in wire drawing
When have lubricant layer bring lubricant into wire drawing, to set up good drawing lubrication condition.
The coating of the prior art has phosphatization membrane coat, boronation coating, lime soap coating, organic resin coating, anacidity washcoated
Layer；Though wherein traditional phosphatization membrane coat binding strength is strong, coating remnants membrane removal is difficult, and the quality of finished product steel wire is bad.It is existing
Though some boronation coatings and the remaining membrane removal of lime soap coating are preferable, in drawing process and unstable, speed may be only available for
Spend very low drawing process.Though being combined in existing organic resin coating drawing process preferably, also more stable, lubricant band
Entering property is poor, it is difficult to guarantee the speed in drawing process, the steel wire drawing process low suitable for speed.Existing anacidity washcoat
Although stability, binding strength are all preferable, high speed drawing process high temperature resistant degree is poor.
Those skilled in the art have been devoted to improve existing steel wire lubricant coating, preferably apply to obtain effect
Layer, with the steel wire drawing being suitable under conditions of high speed, high temperature.
Bonderite and preparation method are used before CN201110103063.6 steel wire high speed drawing, drawing speed can be improved in open one kind
Bonderite and preparation side are used before the smooth and uniform steel wire high speed drawing of steel wire surface after spending, prevent steel wire from breaking, guaranteeing drawing
Method, including slot agent and replenishers are built, the raw material for building slot agent and mass percent are: the phosphatase 11 3 ~ 15% of concentration 85%, nitric acid
11 ~ 14%, zinc oxide 10 ~ 13%, nickel nitrate 0.3 ~ 0.6%, surplus is water；The raw material and mass ratio of the replenishers are: concentration
85% phosphoric acid 26 ~ 32%, nitric acid 6.5 ~ 9.5%, zinc oxide 10 ~ 13%, nickel nitrate 0.1 ~ 0.4%, surplus are water.It can effectively improve
Drawing speed (up to 16 meter per seconds), prevent steel wire from breaking, guarantee drawing after steel wire surface it is smooth and uniform, substantially increase life
Produce efficiency.But its remaining membrane removal is poor, and the quality of finished product steel wire is bad.
The low slag of CN201811634330.0, inexpensive high speed drawing phosphating solution and use technique, provide a kind of low slag, it is low at
This high speed drawing phosphating solution include 10~60g/L of zinc ion, 1~10g/L of calcium ion, 25~80g/L of phosphate radical, nitrate anion 10~
60g/L, 5~20g/L of organic acid, 0.1~1g/L of sodium nitrite.The phosphatization slag deposits of this product formation, will not in trough bottom
It is adhered to wire rod or steel wire surface, will not influence surface quality；But the drawing speed for being not particularly suited for thinner diameter wire is high
Steel Wire Drawing Process.A kind of Lubrication for Steel-wire Drawing cream of CN201410631004.X and preparation method thereof discloses a kind of steel wire drawing
Lubrication cream and preparation method thereof is pulled out, metal cold working with lubricator field is belonged to.This lubrication cream is by weight by the oiliness of 10-20%
Agent, the surfactant of 5-10%, the organic deruster of 1-3%, the extreme pressure agent of 10-15% and water composition, the lubricant also wrap
Include one of preservative, defoaming agent, fungicide or a variety of.Its preparation step includes: 1) by metering than taking oiliness improver, surface living
Property agent, extreme pressure agent, solid additive, be warming up to 80-120 DEG C after mixing, high-speed stirred while applies high-power ultrasonic wavelength-division
It dissipates uniform.2) remaining ingredient is mixed with water, is warming up to 70-90 DEG C, high-speed stirred while applies high-power ultrasonic dispersion
Uniformly.3) it 1) will be mixed with 2) resulting material, be warming up to 50-70 DEG C, high-speed stirred while applies high-power ultrasonic, deeply
It is uniformly dispersed.The lubrication cream is very suitable to the lubrication of the Various Complexes working conditions such as rusty stain, rough steel wire, high speed drawing
Agent, but it is not particularly suited for the lower steel wire high speed drawing of fineness.
Some lubricant coatings general at present are difficult to ensure the surface matter of steel wire in steel wire high speed drawing in use
Amount, seriously constrains the raising of fine wire drawing speed.Existing lubricant coating rust-proof effect is poor simultaneously, and preparation efficiency is not
Height, steel wire drawing speed is slow, and production efficiency is low, and finished surface scuffing, crackle, ring occurrence rate are higher.
Summary of the invention
In view of the above technical problems, lubrication painting is formed the present invention provides a kind of lubricant coating of steel wire and in steel wire surface
The method of layer, reaches following goal of the invention: suitable for the high speed drawing of fine wire, making steel wire during the drawing process has well
Surface quality, and improve steel wire drawing speed, while accelerating coating preparation speed, improve productivity effect, reduce finished surface
Scuffing, the generation of crackle, ring.
The method that the present invention provides a kind of lubricant coating of steel wire and forms lubricant coating in steel wire surface
A kind of lubricant coating of steel wire, is formed by two layers, from inside to outside respectively phosphorization membrane and boronation film layer.
The phosphating coat 1.4-6.1g/ ㎡；The boronation film 0.3-5.1g/ ㎡.
The phosphorization membrane is composed of the following components: trbasic zinc phosphate, zinc iron phosphate, wherein zinc iron phosphate accounting is about 5%.
Coating is collectively formed in internal layer phosphorization membrane and outer layer boronation film layer, so that coating and steel base binding ability are strong, prolongs
Malleability is good, and absorption wire drawing powder effect is good.
Whole lubricant coating bond strength is high, heat resistance is good, plasticity is good, be easy to adsorpting lubrication agent, with antirust ability,
Acid residual to steel wire surface has neutralization.It is showed in drawing process splendid, is able to satisfy the high speed drawing of steel wire.
As described above steel wire surface formed lubricant coating method the following steps are included:
A) steel wire phosphorization is handled.Steel wire carries out continuous fast bonderizing processing in Zinc phosphating solution.General Acidity in Phosphating Solution is 6.5-
13 points, free acidity is 0.4-2 point, and sour ratio >=6, phosphatization temperature is 72-98 DEG C, phosphating time 3-5s.Obtained phosphating coat
Porosity be 0.5%-1%, can with steel wire extend 15 times more than not peel off, holding basic performance.
The processing mode can guarantee that phosphating coat crystal structure is to be most suitable for as-drawn, have suitable loose hole, and more
Good deformation continuity, to guarantee lubricant coating to the extension ability in the absorption and drawing process of wire drawing powder.
B) steel wire is washed.Steel wire is washed by waterfall type, clean the surface remaining solution.It is washed by the road 2-4 waterfall type, water
Washing the time is 2-3s, and surface ion is remained less than 0.1 ㎎/cm2。
C) steel wire applies boron processing.During steel wire carries out in borax soln and borax treatment.Borate concentration is 60-200g/L,
Temperature is 80-100 DEG C, and the boronation time is 2-4s, forms boronation film 0.3-5.1g/ ㎡.
The treatment process can guarantee the thickness of borax and the neutralization to steel wire surface acidity, form preferably lubrication
Coating.
D) steel wire drying and processing.Steel wire carries out drying and processing in drying box.Drying temperature is 240-300 DEG C, when drying
Between be 2-3s.
The treatment process can make the borax on lubricant coating surface become more suitable five water crystallizations body, more close to be formed
Suitable lubricant coating.Drying can guarantee that steel wire surface without residual moisture, guarantees the resistance to corrosion of steel wire simultaneously.
Lubricant coating of the present invention has the beneficial effect that
(1) lubricant coating of the present invention is applicable to the finer wire high speed drawing of steel wire diameter 3-6.5mm, phosphorus content 0.7% or so,
High with the bond strength of steel wire, removing rate is lower than 3% after drawing；Steel wire drawing speed is improved to 8m/s or more；Coating can be with steel wire
Extend 15 times or more not peel off, keeps the basic performance of coating.During steel wire drawing, surface scratching, crackle, ring occurrence rate
It is reduced to 0.05% or less.The steel wire of drawing is carried out by the lubricant coating, torsion data improve 5 or more in the case of same specification.
(2) coating heat resistance of the present invention is good, 250 DEG C of greasy properties for not influencing coating；
(3) coating adsorpting lubrication agent effect of the present invention is good, and adsorpting lubrication agent adsorption capacity compared with routine techniques promotes 1.5 times.
(4) coating of the present invention has good antirust ability, and has neutralization to the residual acid of steel wire surface；To being coated with this
The steel wire of invention coating carries out salt spray test, first appears corrosion product time 5h or more.
(5) within steel wire can be made to save 45 days any variation does not occur for coating of the present invention, during which can also continue to drawing, protects
Card wire quality does not change, and coating spread is good.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, art technology
Personnel's every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
A kind of lubricant coating of the steel wire of embodiment 1 and the method for forming lubricant coating in steel wire surface
A kind of lubricant coating of steel wire, is formed by two layers, from inside to outside respectively phosphorization membrane and boronation film layer；Phosphating coat
3.2g/ ㎡, boronation film 3.1g/ ㎡.
The phosphorization membrane is composed of the following components: trbasic zinc phosphate, zinc iron phosphate, wherein zinc iron phosphate accounting is 5%.
In the method that steel wire surface forms lubricant coating, the specific steps are as follows:
The steel wire diameter that the present embodiment uses is 5.5mm, C content 0.72%；
A) steel wire phosphorization is handled, and steel wire carries out continuous fast bonderizing processing in Zinc phosphating solution.General Acidity in Phosphating Solution is 8 points,
Free acidity is 1 point, and sour ratio 8, phosphatization temperature is 90 DEG C, phosphating time 3s.
B) steel wire is washed, and steel wire is washed by waterfall type, clean the surface remaining solution.It is washed by 2 waterfall types, washing
Time is 2s.
C) steel wire applies boron processing, during steel wire carries out in borax soln and borax treatment.Borate concentration is 160g/L, temperature
It is 90 DEG C, the boronation time is 2s.
D) steel wire drying and processing, steel wire carry out drying and processing in drying box.Drying temperature is 270 DEG C, and drying time is
2s。
A kind of lubricant coating of the steel wire of embodiment 2 and the method for forming lubricant coating in steel wire surface
A kind of lubricant coating of steel wire, is formed by two layers, from inside to outside respectively phosphorization membrane and boronation film layer, phosphating coat
3.5g/ ㎡, boronation film 3.4g/ ㎡.
The phosphorization membrane is composed of the following components: trbasic zinc phosphate, zinc iron phosphate, wherein zinc iron phosphate accounting is 5%.
In the method that steel wire surface forms lubricant coating, the specific steps are as follows:
The steel wire diameter that the present embodiment uses is 6.5mm, C content 0.72%；
A) steel wire phosphorization is handled, and steel wire carries out continuous fast bonderizing processing in Zinc phosphating solution.General Acidity in Phosphating Solution is 8 points,
Free acidity is 0.8 point, and sour ratio 10, phosphatization temperature is 85 DEG C, phosphating time 4s.
B) steel wire is washed, and steel wire is washed by waterfall type, clean the surface remaining solution.It is washed by 3 waterfall types, washing
Time is 2.4s.
C) steel wire applies boron processing, during steel wire carries out in borax soln and borax treatment.Borate concentration is 180g/L, temperature
It is 93 DEG C, the boronation time is 2.4s.
D) steel wire drying and processing, steel wire carry out drying and processing in drying box.Drying temperature is 230 DEG C, and drying time is
2.4s。
A kind of lubricant coating of the steel wire of embodiment 3 and the method for forming lubricant coating in steel wire surface
A kind of lubricant coating of steel wire, is formed by two layers, from inside to outside respectively phosphorization membrane and boronation film layer, phosphating coat
4.0g/ ㎡, boronation film 1.5g/ ㎡.
The phosphorization membrane is composed of the following components: trbasic zinc phosphate, zinc iron phosphate, wherein zinc iron phosphate accounting is 5%.
In the method that steel wire surface forms lubricant coating, the specific steps are as follows:
The steel wire diameter that the present embodiment uses is 3.10mm, C content 0.70%；
A) steel wire phosphorization is handled, and steel wire carries out continuous fast bonderizing processing in Zinc phosphating solution.General Acidity in Phosphating Solution is 11 points,
Free acidity is 1.5 points, and sour ratio 7, phosphatization temperature is 83 DEG C, phosphating time 5s.
B) steel wire is washed, and steel wire is washed by waterfall type, clean the surface remaining solution.It is washed by 4 waterfall types, washing
Time is 3s.
C) steel wire applies boron processing, during steel wire carries out in borax soln and borax treatment.Borate concentration is 100g/L, temperature
It is 90 DEG C, the boronation time is 3s.
D) steel wire drying and processing, steel wire carry out drying and processing in drying box.Drying temperature is 270 DEG C, and drying time is
3s。
It is tested through workshop, the steel wire for being coated with lubricant coating that the embodiment of the present invention is obtained carries out drawing, in drawing speed
In the case where improving to 8m/s, performance is good in drawing process, and drawing process is smooth, and no overheat, the situation of fracture of wire occur.Table
Face scuffing, crackle, ring occurrence rate are reduced to 0.05% hereinafter, finished product wire quality is good.
The steel wire of drawing is carried out by the lubricant coating, torsion data improve 5 or more in the case of same specification, and surface quality is bright
It is aobvious to be promoted.Steel wire storage time can extend to 45 days any variation not occur before drawing simultaneously, can direct drawing without coating.
It, can according to the technique and scheme of the present invention and this hair it is understood that for those of ordinary skills
Bright design is subject to equivalent substitution or change, and all these changes or replacement all should belong to the guarantor of appended claims of the invention
Protect range.
Claims (6)
1. a kind of lubricant coating of steel wire, it is characterised in that: formed by two layers, from inside to outside respectively phosphorization membrane and boronation film
Layer；The phosphating coat 1.4-6.1g/ ㎡；The boronation film 0.3-5.1g/ ㎡；The phosphorization membrane is composed of the following components:
Trbasic zinc phosphate, zinc iron phosphate, wherein zinc iron phosphate accounting is 4-7%.
2. a kind of method for forming lubricant coating in steel wire surface according to claim 1, it is characterised in that: the profit
Coating production is slided the following steps are included: a) steel wire phosphorization processing, b) steel wire washing, c) steel wire painting boron processing, d) steel wire baking
Dry-cure.
3. a kind of method for forming lubricant coating in steel wire surface according to claim 2, it is characterised in that: the step
A) steel wire phosphorization is handled, and General Acidity in Phosphating Solution is 6.5-13 point, and free acidity is 0.4-2 point, sour ratio >=6, phosphatization temperature 72-
98 DEG C, phosphating time 3-5s, the porosity of obtained phosphating coat is 0.5%-1%.
4. a kind of method for forming lubricant coating in steel wire surface according to claim 2, it is characterised in that: the step
B) steel wire is washed, and is washed by the road 2-4 waterfall type, washing time 2-3s, and surface ion is remained less than 0.1 ㎎/cm2。
5. a kind of method for forming lubricant coating in steel wire surface according to claim 2, it is characterised in that: the step
C) steel wire applies boron processing, borate concentration 120-200g/L, and temperature is 80-100 DEG C, and the boronation time is 2-4s, forms boronation film
0.3-5.1g/㎡。
6. a kind of method for forming lubricant coating in steel wire surface according to claim 2, it is characterised in that: the step
D) steel wire drying and processing, drying temperature are 240-300 DEG C, drying time 2-3s.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910279200.8A CN110144574A (en) | 2019-04-09 | 2019-04-09 | A kind of lubricant coating of steel wire and the method for forming lubricant coating in steel wire surface |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910279200.8A CN110144574A (en) | 2019-04-09 | 2019-04-09 | A kind of lubricant coating of steel wire and the method for forming lubricant coating in steel wire surface |
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| CN110144574A true CN110144574A (en) | 2019-08-20 |
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ID=67588263
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1786280A (en) * | 2005-12-13 | 2006-06-14 | 武汉市源锋线材制品有限公司 | Treatment technology of prestressed wire material surface |
| CN101085454A (en) * | 2007-06-26 | 2007-12-12 | 宝钢集团上海二钢有限公司 | Method for preparing phi7.0mm1770MPa high-strength low-relaxation zinc-coated wire |
| CN102011110A (en) * | 2009-09-08 | 2011-04-13 | 日本帕卡濑精株式会社 | Iron group metal material after black surface treatment and manufacturing method thereof |
| CN101818545A (en) * | 2010-04-29 | 2010-09-01 | 天津市银龙预应力钢材集团有限公司 | Prestressed spiral rib steel wire with large diameter and high strength and manufacturing method thereof |
| CN103495613A (en) * | 2013-10-15 | 2014-01-08 | 贵州钢绳股份有限公司 | Production process and drawing equipment of phi-5.0mm 1960MPa super-strength steel wires |
| CN103757620A (en) * | 2014-02-07 | 2014-04-30 | 蚌埠市钰诚新材料科技有限公司 | Phosphating solution for drawing of low-carbon and medium-carbon steel wire rod |
| CN105214924A (en) * | 2014-06-26 | 2016-01-06 | 淮安富民科技有限公司 | A kind of application techniques of crop dryer surface |
| CN104694948A (en) * | 2015-04-07 | 2015-06-10 | 奥盛新材料股份有限公司 | Prestressed steel strand aeration acid pickling tank and acid pickling method thereof |
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